Science is a Process, not an Object.

Honors Biology Prep

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Intro to Enzyme Kinetics

Enzymes really are at the heart of how our bodies work. The brief definition is a "bio-catalyst." These are almost always proteins. They lower activation energy of a particular reaction and as such speed it up, both in the forward and backward direction. Almost all enzymes will be able to work either "backwards" or "forwards." Some are effectively one-directional because of large negative delta G0, for example involving ATP hydrolysis. But, even most of these can be reversed.
Enzyme function requires particular structures. Structures of proteins can be altered by the binding of other proteins or other smaller molecules, or the addition of a phosphate to the enzyme at a specific point, or the local pH or charge distribution…so, every step of enzyme function can be regulated.
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Energy

In some sense, all science comes down to understanding energy. If someone ever asks you why something happens, you can answer: "The second law of thermodynamics." It's never wrong, but also may not be very helpful unless you can make the connection to more local causes. This is the beginning of the discussion, with a biological theme.
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Cells Intro

The image above was lifted from an article in "The Daily Mail," found here.
It is a really bad representative cell, since it is a famous cancer cell line known as HeLa cells and it behaves in ways very much unlike good, normal cells. But, you can see a nucleus (stained for DNA in blue) and some fibers that are part of the "cytoskeleton." To see those, the researchers have used a technique to make them glow either red (microtubules) or green (actin fibers…or microfilaments.
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